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<title>Patching in brief</title>
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<p>The picture below shows 3 different pairs of fibres requiring different types 
of patches. The first pair shows two standard forwardly propagating fibres 
slightly misaligned. </p>
<p>The second and third cases show a forward fibre patched to two different 
alignments of backward fibres. Needless to say that PTC computes the patches 
automatically using the exit basis of the first fibre and the entrance basis of 
the second fibre. If patching is impossible, PTC returns an error. </p>
<p><img border="0" src="patching.jpg" width="82%" height="459"></p>

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